Are all above items normal?
z
For No.4 cylinder: 2BH
z
For No.5 cylinder: 2BB
z
For No.6 cylinder: 2BD
No
Replace the fuel injector.
9
Is the air cleaner element free of
clogging?
Yes
Go to the next step.
No
Replace the air cleaner element.
10
Perform the spark test.
(See
ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.5]
.)
Is strong blue spark visible at each
cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning
part.
11
Install the fuel pressure gauge between
the fuel filter and fuel distributor.
Short check connector terminal F/P to
body GND using a jumper wiring.
Turn the ignition switch to the ON
position (Engine off).
Is the fuel line pressure correct with
ignition switch at ON?
(see
FUEL LINE PRESSURE
INSPECTION [MZI-3.5]
.)
Yes
Go to the next step.
No
Zero or low:
Inspect the fuel pump relay and fuel
pump circuit.
Inspect the fuel line for clogging.
If there is no malfunction, replace the
fuel pump unit.
(see
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
3.5]
.)
High:
Replace the fuel pump unit.
(see
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
3.5]
.)
12
Inspect the following PIDs:
z
ECT
z
O2S11 (When engine can be
started.)
z
O2S12 (When engine can be
started.)
z
O2S21 (When engine can be
started.)
z
O2S22 (When engine can be
started.)
z
MAF
(see
PCM INSPECTION
[MZI-3.5]
.)
Are PIDs normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning
part.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:38 AM
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